Alternating-current telegraph repeater



1,631,675 June 7 1927' J. P. FERRITER ET AL LTERNATING CURRENT T'ELEGRAPH REPEATER Filed Sept. 5, 1925 m A l I k nnnlllmk- N 'f :illllllllllIP-j- HHI lllllllllll III Illlilllll l Patented June 7, `1927'.

UNITED JOHN P, nnnnirnmvfprj OCEANPQRT,

ALTERNATING-CURREN'T TELEGRAPH REPEATER.

Application filed September A3l, 1925. Serial No. 54,289.

The general object of this invention is to provide a means of repeating telegraph signals from aV telegraph circuit-operated with alternating current to another similarly operated circuit. y Y

A more specific object is'to so interconf neet two alternating current quadruplex sets, that, when one of the interconnected sets is connected to the terminal of an alternating current telegraph line and the other set is connected to a secondv alternating current telegraph line, signals may be repeated from one line to the other in both directions simul! taneo-usly.l y

TWith the foregoing and other objects in view the invention consists in the combination and arrangement. of parts set forth hereinafter, certain embodiments being illustrated in the accompanying drawings in which: Y n

Figure l represents diagrammatically two alternating current quadruplex sets in connection with our device.

Figure 2 represents diagrammatically in detail a modified arrangement whereby the batteries in the plate circuits 0f the transniittingtubes may be replaced by an alter-V nating current.

Tn Figure l, X and Y represent two alternating current quadruple); sets, each suitably arranged for the transmission and reception of four messages simultaneously, two in one direction and two in the other, so interconnected that signals received from the line on one set are repeated directly to the transmitting circuit of the other set. This system of alternating current telegraphy has been fully described in another patent application` The signals received from the west line are repeated to the east line in the following manner. A series of negative pulses received from the west line causes a pulsating current to flew in the plate circuit of vacuum tube V. This circuit includes the primary winding P of a step-up transformer T. n The plate current passing through P causes grid G6 of transmitting tube V6 totake on an alternating potential with respect to its filament. This causes a pulsating current` to flow in the plate circuit .of the tube V6. This pulsating current flows from the earth E,

through battery B, filament and plat/e of tube V6, to the junction J of the equal arm resistance bridge R and R1, where it divides half going to the earth through the artificial c line AL and half to the east 'line and to the distant terminal. A series of positive pulses -ing P1y of a step-up transformer T1. yThe platecurrent passing through P1 causes grid rreceived from the west line causes a pulsating Gr, of tube V7 to become alternately posit-ive and negative, causing a'pulsating current to flow in the plate circuit of tube V7. This current flows in a positivedirection from the earth E, through battery B1, plate and filament of V7, to Junction J where it'divides as described before, half going to the earth through the artificial line AL and half over the east line to the distant terminal. It will be vreadily seen how signals from the east line are repeated in the same manner to the transmitting tubes ,of set X and passed to the west line. j 1

If desired, batteries B, B1, B2 and B3, in the plate circuits of the transmitting tubes, mayv be replaced by alternating current of any desired audible frequency. The arrangement for this is shown in Fig. 2, where F is connected to the filament of tube V2VV and PL to the plate of tube V3; F1 to the lilament of tube V6 and PL1 to theplate of l tive impulses and the other of each pair toy receive positive impulses from its adjacent line, the grids of said transmitting tubes and the plates of said receiving. tubes being connected by means of a step-up-transformer, the plate current from said receiving tubes Vsating l'Currentsin their adjacent transinitcausing7 by means of said transformers, the ting` tubes7 half of said currentk being passed grids of said transmitting tubes to take on to the corresponding` line and to the desired an alternating potential with relation to distant station. I v. their filaments andrproduoea pulsating cur Y In testimony whereof .We afix our signa- I rent in their plates a pair of equal-arm retures. 'g s istance bridges adapted to divide thel pull JOHN P. FERRITER.v

' V V4vWESLEY Tr-GUEST.- 

